On July 23, 1972, NASA launched Landsat-1, the first Earth-imaging satellite. The ongoing Landsat program offers “the longest continuous global record of the Earth’s surface.”
Landsat-1 was originally known as the Earth Resources Technology Satellite. It carried two imaging instruments. The most powerful instrument was the Multispectral Scanner (MSS). The MSS recorded data in four bands of the electromagnetic spectrum: green, red, and two bands of infrared radiation.
amount of sky covered with clouds.
edge of land along the sea or other large body of water.
(singular: datum) information collected during a scientific study.
continous band of all kinds of radiation (heat and light).
ecosystem filled with trees and underbrush.
mass of ice that moves slowly over land.
distinct group of people who share a language, culture, economic status, or physical proximity.
part of the electromagnetic spectrum with wavelengths longer than visible light but shorter than microwaves.
body of land surrounded by water.
range of purposes people put to the earth.
(National Aeronautics and Space Administration) the U.S. space agency, whose mission statement is "To reach for new heights and reveal the unknown so that what we do and learn will benefit all humankind."
to give or make available.
object that orbits around something else. Satellites can be natural, like moons, or made by people.
photographs of a planet taken by or from a satellite.
an opening in the Earth's crust, through which lava, ash, and gases erupt, and also the cone built by eruptions.
repeating or predictable changes in the Earth's atmosphere, such as winds, precipitation, and temperatures.